WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 12, 2013
A New Control Strategy for DFIG Wind Farm with VSC-HVDC Integration
Authors: ,
Abstract: This paper proposes a new control strategy for a doubly-fed induction generator (DFIG) wind farm with VSC-HVDC integration to ensure a secure and reliable operation of the whole system. Based on a virtual voltage orientation, a steady-state voltage control block and a dynamic voltage control block with a cross-product term of d-q currents are separately designed for wind-farm-side VSC (WFVSC) to control the wind farm voltage. Meanwhile, with the consideration of ac and dc side parameters variation and external disturbance, an improved backstepping control scheme with Lyapunov stability proof is designed for the grid-side VSC (GSVSC). To validate the proposed control strategy, three different simulation cases with consideration of system parameters variation and external disturbances are introduced, and numerical simulation results for a 200MW DFIG wind farm with VSC-HVDC integration confirm that the proposed control strategy is of great satisfactory operation performance.
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Keywords: Doubly fed induction generator (DFIG), voltage source converter (VSC), high voltage dc transmission (HVDC), wind farm, backstepping, Power quality